My answer depends on what your favorite Pokemon are. Simply put, if you are really a fan of some, that might make a difference. X and Y are completely new and most Pokemon are available between the two.
Not all, so check which ones are version exclusive before you buy. It has features and a story that will be completely new, so it's enticing. Now, the new mega-evolution mechanic does throw a wrench into things.
If you find that interesting it could not only help you decide X vs. Y (Do you prefer Charizard X and Mewtwo X over their Y versions, or the version exclusive stones) but also lean you towards ORAS. I haven't played it but it seems like it would border on playing a new game, just with the familiar storyline. They also offer more Mega Evolutions WITH the previous ones available from X and Y in there as well.
Some of your favorites that you may really want to mega-evolve might be only able to do so in ORAS, so if that makes a difference I'd consider that. Normally, I'd just say X or Y, and make that decision between the two on which one has the better version exclusives to you. That is Xerneas vs. Yvetal, Mega Charizards and Mewtwos X and Y, Mega Houndoom vs. Mega Manetric, Dragalge vs. Clawitzer (new pokemon), etc.
I'd go with X or Y since you played the old ruby and sapphire version before you know partly what to expect. Just a thought. C.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.